[c-nsp] tracepath

[Peter Rathlev]

On Tue, 2012-11-27 at 10:12 +0200, M K wrote:
> I was wondering about the below output , when i get the no reply ,
> does that mean that i faced a change in the MTU through the path?Can i
> detetct MTU vlaue through the path if configured ? 
<snip>

You're really not making it easy for anyone with that formatting. Please
consider using a mail user agent that does sane formatting.

> [root at core ~]# tracepath -n www.facebook.com
> 1:  172.16.2.225      0.135ms pmtu 1500
> 1:  172.16.2.1        0.404ms
> 2:  92.62.113.77    asymm  1   0.929ms
...
> 16:  no reply
<continues to the end>

This just means that the target does not accept traffic destined to the
UDP port in question. Since www.facebook.com accepts ping requests you
could use traceroute to test the 1500 byte PMTU:

 traceroute -I -q 1 -n -F www.facebook.com 1500

-- 
Peter